As red blood cell components are recycled, the heme group is converted by the liver to ____
a. bilirubin
b. bile
c. iron
d. proteins
e. amino acids
ANSWER: a
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Supercoiling is important for DNA structure, because
A) it holds together the antiparallel strands of DNA in the double helix. B) it provides energy for transcription. C) it condenses the DNA so that it can fit inside the cell. D) it prevents RNA from pairing with DNA in the double helix.
Bacteria may be stored
A. on a slant in the refrigerator. B. frozen in glycerol solution. C. freeze-dried. D. in broth at 37?C. E. on a slant in the refrigerator, frozen in glycerol solution, AND freeze-dried.
All of the following are located on the exterior
surface of a prokaryote EXCEPT a. flagellum b. pilus c. plasma membrane d. capsule e. none of these
Trachoma is caused by
a) Chlamydia trachomatis. b) Neisseria gonorrhoeae. c) Aspergillus. d) Haemophilus influenzae.